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ppmbrighten - change an images Saturation and Value from an HSV map
ppmbrighten [-n] [-s <+- saturation>] [-v <+- value>] <ppmfile>
Reads
a portable pixmap as input. Converts the image from RGB space to HSV space
and changes the Value by <+- value> as a percentage. Likewise with the Saturation.
Doubling the Value would involve
ppmbrighten -v 100
to add 100 percent to
the Value.
The 'n' option normalizes the Value to exist between 0 and 1 (normalized).
pgmnorm(1)
, ppm(5)
Copyright (C) 1990 by Brian Moffet Copyright
(C) 1989 by Jef Poskanzer.
Permission to use, copy, modify, and distribute
this software and its documentation for any purpose and without fee is
hereby granted, provided that the above copyright notice appear in all
copies and that both that copyright notice and this permission notice appear
in supporting documentation. This software is provided "as is" without
express or implied warranty.
This program does not change the number
of colors.
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